Right middle lobe collapse
Cough and shortness of breath. Non-smoker.
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Triangular shaped opacity medially in the right lower zone, with effacement of the right heart border silhouette.
Subtle volume loss in the right hemithorax.
Left lung clear. Heart size normal.
When the right middle lobe collapses, it does so medially, with the collapsed lobe abutting the right atrium, so that the right heart border silhouette is effaced.
In a middle-aged patient CT chest and bronchoscopy are the typical next investigations.
In a younger patient, the underlying cause is unlikely to be malignant, and therefore a more conservative management approach may be possible.